PROPERTY PLANT AND EQUIPMENT NET (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
PROPERTY PLANT AND EQUIPMENT NET
Leasehold improvements	$ 431	$ 430
Equipment	5,191	5,218
Sales demonstration equipment	807	754
Property and equipment gross	6,429	6,402
Less accumulated depreciation	5,476	5,456
Property and equipment, net	$ 953	$ 946

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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